Electron Dispersion Below Inverted-V Energies: Resonant Deceleration and Acceleration by Alfvén Waves

Details Electron Dispersion Below Inverted-V Energies: Resonant Deceleration and Acceleration by Alfvén Waves Electron Dispersion Below Inverted-V Energies: Resonant Deceleration and Acceleration by Alfvén Waves

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm22c..04c&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM22C-04

Physics

2407 Auroral Ionosphere (2704), 2704 Auroral Phenomena (2407), 2712 Electric Fields (2411), 2736 Magnetosphere/Ionosphere Interactions, 7867 Wave/Particle Interactions

Scientific paper

We report on studies of resonant interactions of inertial Alfvén waves with electrons along auroral field lines. The electrons in resonance can be accelerated or decelerated by the parallel electric field of the wave depending on whether the velocity of the electrons is less or greater than the Alfvén wave velocity. In this paper, we emphasize the resonant deceleration process and its effects on electrons that have gone through a parallel potential drop (the inverted-V electrons). When the backscattered population is included, a combination of resonant acceleration and deceleration effects accounts well for rocket observations of electron energy dispersion extending from the inverted-V energies to lower energy. Characteristics of the dispersion tail such as the dispersion time scale and the intensity distribution along the tail may be used to deduce the Alfvén wave properties and the parent electron spectra. Examples of the model wave signatures and their dependence on the electron population will be shown.

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